Define rotation and revolution.

Rotation refers to the spinning motion of a celestial body around its own axis. Earth, for example, rotates around its axis from west to east, completing one full rotation approximately every 24 hours. This rotation is responsible for the cycle of day and night on Earth. The axis is an imaginary line that runs from the North Pole to the South Pole. The rotation of a planet contributes to the flattening at the poles and bulging at the equator due to centrifugal forces.

Revolution:
Revolution, on the other hand, is the orbital motion of a celestial body around another celestial body. In the case of Earth, it revolves around the Sun in an elliptical orbit, completing one orbit approximately every 365.25 days. This revolution is responsible for the changing seasons as Earth’s axial tilt causes different parts of the planet to receive varying amounts of sunlight at different times of the year.

In summary, rotation involves a celestial body spinning around its own axis, causing day and night, while revolution involves a celestial body orbiting around another, influencing the length and characteristics of years and seasons.